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M45PE40-VMW6TP Datasheet

  • M45PE40-VMW6TP

  • 4 Mbit, Low Voltage, Page-Erasable Serial Flash Memory With ...

  • 538.70KB

  • 35页

  • STMICROELECTRONICS   STMICROELECTRONICS

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M45PE40
Read Status Register (RDSR)
The Read Status Register (RDSR) instruction al-
lows the Status Register to be read. The Status
Register may be read at any time, even while a
Program, Erase or Write cycle is in progress.
When one of these cycles is in progress, it is rec-
ommended to check the Write In Progress (WIP)
bit before sending a new instruction to the device.
It is also possible to read the Status Register con-
tinuously, as shown in
Figure 10..
The status bits of the Status Register are as fol-
lows:
WIP bit.
The Write In Progress (WIP) bit indicates
whether the memory is busy with a Write, Program
or Erase cycle. When set to 1, such a cycle is in
progress, when reset to 0 no such cycle is in
progress.
WEL bit.
The Write Enable Latch (WEL) bit indi-
cates the status of the internal Write Enable Latch.
When set to 1 the internal Write Enable Latch is
set, when set to 0 the internal Write Enable Latch
is reset and no Write, Program or Erase instruction
is accepted.
Figure 10. Read Status Register (RDSR) Instruction Sequence and Data-Out Sequence
S
0
C
Instruction
D
Status Register Out
High Impedance
Q
7
MSB
6
5
4
3
2
1
0
7
MSB
AI02031E
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15
Status Register Out
6
5
4
3
2
1
0
7
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